Electrical receptacle.



R. B. BENJAMIN. ELECTRICAL REGEPTACLE.

APPLICATION FILED OCT. 16. 19!].

1 ,284 564. I J Patented Nov. 12, 1918.

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REUBEN B. BENJAMIN, 0F CHICAGO, ILLINOIS, ASSIGNOR T0 BENJAMIN ELECTRIC MANUFACTURING COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

Specification of Letters Patent.

Patented Nov. 12, 1218.

Application filed October 16, 1917. Serial No. 196,814.

To all whom it may concern Be it known that I, REUBEN B. -BENJA- MIN, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented new and useful Improvements in Electrical Receptacles, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawing, forming a part of this specification.

My invention relates to an electrical receptacle.

One of the objects of my invention is'to provide an improved receptacle equipped with means for holding a lamp-base inposition and to prevent it from becoming accidentally unscrewed from the receptacle. Further objects will appear from the detailed description to follow and from the appended claims.

- In the drawings, in which two embodiments of my invention are shown Figure 1 is an axial section of a receptacle embodying my invention;

Fig. 2 is a section on the line 2-2 of Fig. 1, looking in the direction of the arrows;

Fig. 3 is a section on the line 3-3 of Fig. 2, looking in the direction of the arrows;

Fig. 4: is a fragmentary side elevation of a portion of the receptacle;

F ig. 5.is a section on the line 5-5 of Fig. 2, looking in the direction of the arrows;

Fig. 6 is an elevational view showing the leaf-spring for engaging the lamp-base;

Fig. 7 is a section on the line 7--7 of Fig. 6, looking in the direction of the arrows;

Fig. 8 is an elevation of another form of leaf-spring which may be used;

Fig. 9 is a section on the line 99 oi Fig. 8; and

Fig. 10 is a detail sectional 'iew showing the manner in which the leafspring of Fig. 8 may be secured to the shell contact.

Referring now to the drawings in detail, and first to the form of Figs. 1 to 7, inclusive, the receptacle shown comprises an insulating base or support 15, center and shellcontacts 16 and 17, respectively. supported by the insulatin base 15, and binding-terminals 18 and 19. respectively, for the contacts 16 and 17. The center contact 16 and the binding-terminal 18 may be secured in place on the base 15 by means of an eyelet 20, and the shell contact 17 and'binding' terminal. 19 may he held in position on the base 15 by means of an eyelet 21.

The shell contact 17 is provided with a helical, inwardly-extending head 22, which forms a thread for engagement with the threadedcontact of the lamp-base. This head is interrupted for about two-thirds oi a turn, whereby an inwardly-opening, outwardly-closed pocket 28 is formed, in which is located a leaf-spring 24, which exerts pressure on the threaded contact of the lamp-base to prevent it from unscrewing from the receptacle. This leaf-spring 24 is reduced at its central portion as indicated at 25, and this reduced portion is secured beneath a tongue 26 struck up from the shell contact 17 (Fig. 3). The ends of the leafspring 2% extend through openings 2'? in the shell contact 17, the ends having a slight sliding motion in these openings to permit the springing of the portions of the leafspring intermediate the openings 27 and the tongue 26. These intermediate portions of the leaf-springmay be reduced in breadth, as indicated at 28, in order the bett r to enter the trough of the thread of the lamp base.

In operation, when the lamp is screwed into the receptacle, the threaded contact the lamp-base engages the thread the contact 17 formed by the head 22 and is thus threaded into the receptacle.

The leaf-spring 24: engages the threaded contact of the lamp-base with a yielding pressure and prevents it from coming un' screwed due to jarring, etc.

In the form of my inventi'om shown in Figs. 8, 9, and 10, the parts may be the same as in the form just described. with the exception of the leaf-spring in its connection with the threaded shell. In this form the leafspring 29 has an aperture 30 in its intermediate portion, through which extends a tongue 31 struck up from the shell contact 17, the tongue 31 being riveted over to hold the leaf-sprin 29 firmly in position. The ends 32 of this leaf-spring are reduced to form tongues for extending through the openings 27 in the threaded shell contact. The portions 33 of the leaf-spring intermediate the central portion and the ends 32 are curved in cross-section, as indicated in Fig. 9, to conform to the trough of the thread of the contact on the lamp-base. The

cylindrical cup;

having :1 l

operation of this form is the flame 1. form previously r cribe iiin rank c threaded eii contact In,

first formed into smooth The bczwl 2 then formed by means of i l do the shell will one outside the Shell, the roll inside the shell having a groove corresponding in shape to inch :1}. is

the head E52, and the roli rmrsicle 0:. the shell (l or rih Corr pending in xhnpe lo the head This head; on The Outside roll forces the mererial the 17 into the ell. J roove en the inz-iirle roll. intcrrupl'ion in the lrcznl is arrived z= nplv by innii, of Silifl shell contact being interrupted io form a he]ically-cxtenciing inwardly-open, outwardly-closcd pocket integral with said. shell; and a spring located in said porlict for 'relaii'iing ii lump-base in posiiioii.

An electrical receptacle comprising an insulating support; sheet-met: eheil contact s'upportc of said shell contact form :1

located in sc base in pic-- ineulaiing suppo is; a, sheet-metal screw- 'hcli Contact supported thereby the thPreaxi or" seic. sheli con'tzica being interrupted to form a helically-extcmling, inwardly-open, oinwardly-dosed pocket integral with said shell; and a helicelly-extending leaf spring locatcd in said pocket for retaining a lampbase in position, said leaf spriii having spaced portions bearing on said she l contact and portion intermediate said spaced poraions for hearing on a lamp-base. V

1 n electrical receptacle comprising in iHSllliL W support; a sheet-metal screwshcil contact suppcrted thereby, the thread oi said shell contact being interrupted t0 :iorrn a heliwily-extending, inwzircllycpen, 011i;-'al'(ll"-CiOS8d pocket integral with said shell; and a helicallyextcncling leaf spring located ii iii kl. pocket for retaining a lamphnse in poeiiion, said leaf spring havin spaced port-ions hearing on said shell contaci and. a porficn intermediate said spaced poriions for hearing on a lamp-hz1se, saicl interm diate portion being curved in transverse seciiion to conform to the trough of the ihread. of "Hie iiiDZlP-bilSE.

I. fin clcrfirical l'QCQPilClQ comprising an insulufiiw izppori; :1 shecl-mctai screw-shell contact mortal thereby, said sheil contact inning 2i cil'ci lrentiallyextending, in werdi wmvcn .\';ir ll;-,*-closcl pocket inteill with said sheli; and a spring locaiited i 5 pocket; for remiiiing 2L lamp-base in wiicrco have hereunte suh- EN lEENJ-Al fi 

